# extract-h1-as-json-watch

> extract-h1-as-json-watch is a paid API for AI agents from page.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).

Monitors a web page's H1 headings for changes and returns current values, change status, before/after diffs, and last-seen timestamp

## Facts

- Endpoint: GET https://page.intel.rallylive.ca/watch/page/h1/json?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/extract-h1-as-json-watch-7dbce80d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__h9CXYnPTjh1qRytrWsjS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability extract-h1-as-json-watch-7dbce80d
```

Example prompt: Keep an eye on the H1 headings at https://example.com/landing for me — check if they've changed since the last time you looked and show me what's different.

## When to prefer this

Choose this endpoint when you need to continuously monitor a specific web page's H1 headings and detect when they change over time, with automatic diffing against a stored 90-day snapshot. It is ideal for scheduled polling workflows, competitive intelligence, SEO audits, or content change alerts where you want before/after context without managing your own storage. Prefer it over a plain H1 extraction endpoint when change detection and historical comparison are required, not just current-state retrieval.

## Known failure modes

- Target URL is unreachable or returns a non-200 status — extraction fails with an error
- No previous snapshot exists (first call) — changed is false or indeterminate with no before value
- Page has no H1 elements — returns an empty array with changed based on prior empty state
- 90-day snapshot expiry — prior comparison data lost, treated as a fresh baseline
- Rate limiting or payment failure — request rejected before extraction occurs

## How this service works

Change watch for extract h1 as json: runs the check, compares it with the result from your previous call for the same url (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.

## Output

Returns a JSON object containing the current H1 headings extracted from the target page, a boolean 'changed' field indicating whether the content differs from the previous call (retained for 90 days), a list of changed fields with before and after values, and a timestamp of when the page was last seen in its previous state.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/extract-h1-as-json-watch-7dbce80d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from page.intel.rallylive.ca](https://www.zero.xyz/host/page.intel.rallylive.ca/llms.txt)